【摘要】 提出了基于虹膜水印的图像内容认证系统,其基本思想是先进行用户虹膜图像的预处理操作,再将提取出的虹膜代码与噪声可见度函数进行运算生成水印,然后基于人眼视觉系统模型与小波变换方法进行水印自适应嵌入,采用独立分量分析方法进行水印盲提取,经过反变换可得虹膜代码,经过匹配算法实现图像内容所有权人的身份认证.为了更客观地评价水印系统,提出了改进的自适应峰值信噪比度量方法,对图像处理操作具有稳健性.更多还原

【Abstract】 An efficient scheme is presented for protecting the ownership of the digital image content by applying iris feature watermarking.The main idea is as follows.Iris image preprocessing is conducted firstly,which includes iris image de-noising based on wavelet analysis,a coarse-to-precise iris localization,normalization and wavelet-based feature codes extraction,with the watermark generated by the operation between the iris codes and NVF.The second and third steps deal with adaptive iris-based watermark embedding and detecting using the human visual system(HVS) and independent component analysis(ICA).The final step is authentication between the iris codes transformed from the extracted watermark and the iris database.An adaptive PSNR metric is proposed for the more objective evaluation of the watermarking system.Experimental results show that the algorithm has good performance in dealing with various kinds of attack.更多还原